Official

First, the identity of the map at the beginning. In the history of Kyobashi Ward, two similar maps are bound, and there are titles such as "Genroku era Nakano shape" and "Kyoho Shichitora year Nakano shape", respectively, but it does not seem to have detailed sources. did.

But that's the age of the internet. When I went a little bit, I immediately realized that it was a map that was included in the "Ofunai History Book".

Looking at the Digital Collection of the Diet Library, there are not only two of them, but also six of them from the year of Enpo era (1673-1681) to 1862 (1862), and each map has a crank-shaped moat. Was drawn. Moreover, it is painted from the beginning and is easy to understand (see figure above).

Anyway, the history books of Ofunai alone found that during the Edo period, Iribori and Kamejima Kobashi existed at least near late Tokugawa shogunate in 1862 for quite a long time. However, even if you know the rough position as it is, it is difficult to accurately identify which location you are now.

※Image Source: "Ofunai History Book. Second Edition": Diet Library Digital Collection: Bibliographic ID: 000000892148

It is often said that "Tokyo's ward administration began in 1878 in 15 wards", but in March 1869, shortly after the Meiji Restoration, the Tokyo government was born, there was a 50-group system (renamed immediately after the 50-group system). There was a regional division. This is a 50-divided city area called "Shubiki no Uchi", and it was a very interesting way to divide it, as Motoyoshiwara (in Ningyocho) became "Shin Yoshiwara Edomachi" in its original form.

※The 15 wards from 1878 are also divided into "Shubiki no Uchi" in terms of area.

Such a map of the 50th ward era "Tokyo Goju-ku miniature" has been released by the Special Ward Council. Looking at the cover, it is "Kogo September Kai", so it seems to be from Meiji 3 (1870).

The map of the area of "Rokubangumi Minami Kayabacho Others" in it is shown above. Only eight years have passed since 1862 (1862), you can see that the western part of the Iribori has been reclaimed and became a Baba.

In addition, in contact with the mouth of the Iribori, the character is about to disappear a little, but you can read the word "Inari". Apparently, this may be about "Junko Inari".

Image Source: "Tokyo Goju-ku microcosmography 6th group (Minami Kayabacho, others)": Special Interest Incorporated Foundation

Let's go down the times a little more. There was a map after the 50 ward system was replaced by the O ward small ward system in 1871. It is called "Daiichi Dai-kugu ticket map" owned by the Tokyo Metropolitan Archives, which has a huge amount of old maps on the web.

A gu ticket is a land purchase certificate, and a gu ticket map shows a house or land on a map. As a result, it is actually a sugremono that can also be used as a "house guide map".

(It seems that the wording of gu ticket is also coming from here.)

It was released in 1873. Three years after the microcosm of Goju District. As expected, the situation has not changed in three years, and the L-shaped entrance is drawn large.

What is interesting is that there is an increase in the number of bridges over the entrance. And the mystery is that Junko Inari has disappeared somewhere. (Because it's a small Inari, isn't it missing? ？）

Image Source: "Daiichi Dai-ku gu ticket map (15, 16 small wards)": Tokyo Metropolitan Archives

50 ward system → As it has fallen to the O Ward Small Ward System, it is finally a map of the 15th Ward era. It became the 15th ward in 1878, but it was found in Meiji 40 (1908). This is also owned by the Special Ward Council. (left image)

Looking at this ... an important landmark, "Shin Kameshima Bridge", is depicted (Shin Kameshima Bridge was created in 1882). And it's very difficult to read, but you can see the word "inari" in the red painted place. The positional relationship between Shin-Kameshima Bridge and Junko Inari is the same as today!

However, the slender of the heart is so thin that I can't care about! If you think that it is no longer a drainage channel or a gutter rather than an entrance, a small letter called "dark ditch" was added to the above waterway part of the cadastral map (right image) of Meiji 45 (1913), which was slightly lower. Was attached.

"Dark ditch" is an unfamiliar word, but when I looked it up, it said "the same as a culvert." What, as of 1907, it was already invisible from the ground.

Image Source:
“Tokyo City's 5th Category All Figure 1 Nihonbashi-ku All Figures”: Special Interest Incorporated Foundation

"Tokyo City Jugoku and Connection Four-Countries Cadastre Map and Cadastre Register: Nihonbashi-ku": From Chuo-ku history map

If we estimate the current location of Iribori based on the map we have seen so far, we can estimate the current location of Iribori.

　・The positional relationship between Shin-Kameshima Bridge and Junko Inari is the same as the present.

　・The estuary of Iribori is adjacent to the south side of Junko Inari.

For this reason, you can see a way that looks like that. The map on the left side of the image above (a modern map) is that. Also, looking at the actual scenery, narrow alleys continue all the time as if sewing between buildings.

The atmosphere is slightly similar to the alleys of the Hamacho River and the alleys of the Ryukan River. And now: The fact that the alley is protruding on Suzuran Street seems to be the reason that the entrance turned south there.

・・However, when re-reviewing the old map to the present, it is that "earthquake reconstruction project".

By 1907, we found that the Kamejima River Iribori disappeared (at least from the ground).

However, even though the Iribori disappeared, the traces of the former Iribori, called "L-shaped curved road", continued on the subsequent map. Until a certain time.

Yes, "a certain period" is the timing of the Great Kanto Earthquake of 1923 and the implementation of the earthquake reconstruction project.

Until the reconstruction project, the block of Tokyo took over the block of the Edo period. However, the implementation of reconstruction projects has created new large roads one after another, and many blocks have been re-established based on those roads. These new blocks have not changed much in the wake of the Pacific War war, but are often handed down to the current block.

The maps we have referred to so far include the main division lines of the current Kayabacho, such as Shin-ohashi-dori St., Yaesu-dori, and Sakura-dori St. (Noenshin Line), which were born in the reconstruction project. Not included.

It seems that it is necessary to superimpose maps before and after the earthquake ...

Actually, it was the first thing I thought about superimposing old and new maps. The first thing I used was the old and new superposition map provided by the Kyobashi Library (all unified at a scale of 1 / 5,000).

However, as you can see when you actually try it, the old map has surveying errors, printing convenience, and the manual overlap is easily shifted several meters with a little finger movement, It turned out that it would be extremely difficult (for me) to make the old and new "fit match" with the old and new, and I gave up once.

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At that time, I came up with a map of the Geographical Survey Institute. Speaking of the Geographical Survey Institute, before the war, he has been working on precise surveying for many years at the Geographical Bureau of the Ministry of Home Affairs and the Survey Division of the Staff Headquarters. If such a superimposed map of Geographical Institute, wouldn't there be no problem in terms of accuracy at all? ？ ・When I visited the Geographical Survey Institute site ...

About the old 10,000th topographic map "Nihonbashi", which includes this place, there were 6 in the Taisho era alone and 7 in Showa! I think this can be used.

However, the images published on the web were very low resolution. It is said that high-definition items can only be viewed at the Geographical Institute office.

The superposition system on the web was also open to the public, but it was superimposed with aerial photographs, and unfortunately it could not be used for this purpose. 。 。

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I couldn't manage it ... When I was searching here and there, a great site was found. It seems that a teacher at Saitama University has been releasing it as a personal site, and it is a site where you can superimpose and arrange maps of the Geographical Survey Institute! It's called "Nonjaku Map on the Web".

This was strong.

Moreover, what I found out when I tried was that it was easier to understand to arrange them than to overlap. (The mouse cursor is displayed in the same place on the old and new maps and moves in conjunction.)

However, even though the movement is precise, the origin coordinates seem to be slightly shifted. If you believe it as it is, Iribori seems to overlap with Sakura-dori St. (Extension), but it is a bit hesitant to conclude that because the others are slightly off.

Image Source: 「Past and Present Map on the Web」

There seems to be a limit to relying only on digital maps, so I tried various analog maps.

What I found was the "Comparison map before and after the land readjustment of the Imperial Capital Reconstruction Project in 1930", which is included in the Nihonbashi edition of the Chuo-ku Historical Map. It's just perfect for this purpose. (Applicable to District 15)

It is very easy to understand because the left page is before organizing and the right page is after organizing, but it is not possible to make a precise comparison with just by visual inspection.

Therefore ... The figure above shows that each page was scanned and converted into data, the street on the map before the arrangement was painted in red and translucent, and then layered on the map after the arrangement. (Please take a look at it.)

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After the road that looks black is organized, that is, the current road, and the red road is the one before the arrangement.

It is easy to see that the two large roads, Shin-ohashi-dori St. and Sakura-dori St., cross the streets without tidying to the previous block. Conversely, Heisei-dori and Suzuran-dori were not traced.

And the key point of the moat is that the part close to the estuary does not remain as an alley, but it seems that it is now completely under the building. The intuition estimation did not become ate. ・ (T_T)

So, it seems good to think that Kamejima Kobashi I was looking for (ignoring the positional relationship on the old map) was apparently north of the current Junko Inari, near the road in front of the fire brigade building.

According to the official website, Junko Inari was burned down not only in the earthquake but also in the war, but when it was rebuilt again in 1973, it must be thought that it was slightly south than the old place It seems to be.

Image Source: Chuo-ku history map collection book "Comparison map before and after land readjustment of the Imperial Capital Reconstruction Project in 1930"

※If you check the source of the map described in the commentary on the historical map, "Teito Reconstruction District Planning Magazine. Volume 2 of each theory" in the Diet Library Digital Collection, it will be a comparison map different from the one recorded It seems to be. （？ ？ ？）

The image on the left shows the scenery seen from Shin-Kameshima Bridge to Kayabacho. If you turn your gaze down (lower left), there is a part where concrete is unnaturally stretched out.

If you look more closely (right image), there is a round trace as if it were blocking a culvert!

Don't you feel like it's nothing but a trace of the "dark groove" since Meiji period, which was written on the cadastral map?

In terms of location, it fits perfectly with the location estimated by overlaying the map. In the past, "Kamejima Kobashi" may have been built around the photo below a few steps from this estuary (^^)