Seskar

About Chance's lighthouse and lens.
"... The lighting apparatus of the Fresnel diopter system was made by order of Mr. Grissel at the Chance factory near Birmingham. According to this system, one lamp installed at the focus of the device is enough to shed a bright stream of light over the entire horizon.

The fire in question belongs to the 2nd category, i.e. to category of rotating. It shows a glimpse every half minute.
The disassembled cast-iron tower was delivered on the English ship "Honor" to Kronstadt, and from there on July 19, 1858 on a flat-bottomed ship - to the island.

In *The Lighthouse Work of Sir James T. Chance (APPENDIX)*: Fixed and revolving

It was transported to the shore on two barges. To unload cast-iron shields, a special pier was built on ryazhevy boxes, and a small crane was installed on it. In total, 40 sailors participated in loading and unloading operations. A day after the start of work, the entire cargo (about 200 tons) was at the construction site.
The tower was assembled by English craftsmen, 10 selected sailors-riggers from Kronstadt and 6 artisans from the Izhora plant. The general management of the construction was carried out by the builder of the Baltic lighthouses, Lieutenant Colonel Shen, and in his absence, the assistant director of the lighthouses of the Baltic Sea, Lieutenant Colonel Shavernovsky.

A month later, the installation and adjustment work was completed, and on September 23, 1858, the lighthouse began to operate. It was installed on a granite plinth on the foundations of the former brick tower.
It was the first lighthouse tower in Russia made of factory-made cast-iron slabs. The new beacon shone with a constant white light for a distance of up to 12 miles. In subsequent years, lighting equipment and light sources were repeatedly changed on it, but the tower remained unchanged sight to this day. A temporary wooden tower 1859 was moved to Stenscher Island.

The first cast-iron lighthouse in Russia.
https://www.marinetraffic.com/en/photos/of/lights/photo_keywords:1000007669/lights

Original Chance lense in Museum of Lighthouses in Kronshtadt, Russia

2020. Mikhail Borodavkin, Director and Founder of Museum of Lighthouses:
"Behind me is the most valuable exhibit in our museum, it is the very first Fresnel lens used in our country. It was made in 1857 by the English firm Chance in Birmingham, delivered to the lighthouse Seskar and installed in 1858."