forated bronze, and
occasionally of _repousse_ copper; gilt was applied to the hands made of
forged steel.

[Illustration: Figure 26.--DIAL PLATE of a brass lantern clock made by
Bertolla, found in his workshop after his death. (_Courtesy of Museo
Nazionale della Scienza e della Tecnica, Milan._)]

In the course of time, Bertolla's home workshop passed from one
generation to another within the family. Inevitably, it underwent many
modifications until the only original part of the building that remained
intact from Bertolla's time was his clockshop.

[Illustration: Figure 27.--MOVEMENT of a brass lantern clock made by
Bertolla. (_Courtesy of Museo Nazionale della Scienza e della Tecnica,
Milan._)]

Within the last few years, the workshop room was acquired complete with
contents from Bertolla's descendants, and installed in the Museo
Nazionale della Scienza e della Tecnica in Milan as an exhibit of a
typical 18th-century clockmaker's shop. The original workshop was
dismantled in Mocenigo di Rumo and completely rebuilt in the museum,
including the walls, ceiling and floor. The paneling and woodwork of the
walls and ceiling, which have been preserved intact, are hand-cut fir,
with columns, trim and moldings carved by hand. A small painting is
featured in the center of the coffered ceiling. The original shop
benches and chests of drawers are set around the reconstructed shop and
Bertolla's tools and equipment laid out as they had been originally.
Other clockmaker's tools and equipment in the museum's collection are
also displayed. Approximately 40 percent of the tools are the original
items from Bertolla's shop. Parts of clocks and works in progress are
on view on the benches as they were in Bertolla's time.[21] Also
preserved in the museum are sketches found in Bertolla's manuscripts,
some of which are reproduced on the following pages.

[Illustration: Figure 28.--DETAIL OF WALL of Bertolla's workshop, with
regulatory clock made by his nephew, Alessandro Bertolla of Venice. Note
wheel layouts, etc., scribed in the paneling. (_Courtesy of Museo
Nazionale della Scienza e della Tecnica, Milan._)]

[Illustration: Figure 29.--TABLE CLOCK BY BERTOLLA in the collection of
Doctor Vittorio dal Lago of Bergamo. The dial indicates the days of the
week and of the month, the names of the months and lunar phases. The
clock strikes the hours and quarters and repeats. (_Courtesy of Sig.
Luigi Pippa of Milan._)]

The shop contains